polymer-cli
Version:
A commandline tool for Polymer projects
89 lines • 3.76 kB
JavaScript
;
/*
* Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at
* http://polymer.github.io/LICENSE.txt The complete set of authors may be found
* at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
* be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
* Google as part of the polymer project is also subject to an additional IP
* rights grant found at http://polymer.github.io/PATENTS.txt
*/
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
const childProcess = require("child_process");
/**
* Run the given command as a forked child process, and return a promise
* which will reject/resolve with the result of the command.
*
* If the command succeeds the promise will be resolved with the stdout+stderr
* of the command, as a string.
*
*/
function runCommand(path, args, options) {
return __awaiter(this, void 0, void 0, function* () {
let commandError = undefined;
options.silent = true;
const forkedProcess = childProcess.fork(path, args, options);
const outputPromise = pipesToString(forkedProcess.stdout, forkedProcess.stderr);
// listen for errors as they may prevent the exit event from firing
forkedProcess.on('error', (error) => {
commandError = error;
});
const exitCode = yield new Promise((resolve) => {
forkedProcess.on('exit', resolve);
});
if (exitCode !== 0) {
commandError = new Error(`Error running ${path} with args ${args}. ` +
`Got exit code: ${exitCode}`);
}
if (!commandError) {
return outputPromise;
}
// If the command was successful there's no need to print anything to
// the console, but if it failed then its output is probably helpful.
// Print out the output, then reject the final result with the original
// error.
const out = yield outputPromise;
if (options.failureExpected) {
// Throw the output string as our error if failure is expected.
throw out;
}
console.log(`Output of failed command 'node ${path} ${args.join(' ')}' ` +
`in directory ${options.cwd}`);
console.log(out);
throw commandError;
});
}
exports.runCommand = runCommand;
/**
* Reads the two streams and produces a promise of their combined output as a
* string.
*/
function pipesToString(stdout, stderr) {
return __awaiter(this, void 0, void 0, function* () {
let str = '';
const promises = [];
for (const stream of [stdout, stderr]) {
if (!stream) {
continue;
}
stream.setEncoding('utf8');
stream.on('data', function (chunk) {
str += chunk;
});
promises.push(new Promise((resolve) => {
stream.on('end', resolve);
}));
}
yield Promise.all(promises);
return str;
});
}
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